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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Challenges and Perspectives of the Risk Assessment of the Genetic Susceptibility to Cancer in the Next-Generation Sequencing Era
No full textAppropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Identification and characterization of germline mutations in the VHL gene in families with von Hippel-Lindau disease
No full textA doença de von Hippel-Lindau (VHL) é uma síndrome de câncer familial herdada de forma autossômica dominante que predispõe ao desenvolvimento de diversos tipos de neoplasias benignas e malignas. É causada por mutações germinativas e somáticas no gene VHL e tem uma incidência aproximada de um a cada 36.000 nascimentos. O gene VHL é um supressor tumoral e codifica a proteína VHL, a qual possui, entre outras funções, uma atividade ubiquitina-ligase, responsável pela poliubiquitinização e degradação proteassômica da subunidade alfa do fator induzido por hipóxia (HIF) na presença de oxigênio. As principais características da doença de VHL são: hemangioblastomas de sistema nervoso central (SNC), principalmente do cerebelo e medula espinhal; angiomas de retina e carcinoma renal de células claras. A probabilidade de desenvolver cada um desses tumores ao longo da vida é estimada em maior que 70%, podendo manifestar-se desde a infância até a fase adulta, principalmente entre a 2ª e 3ª décadas de vida. Classifica-se a doença de VHL conforme a ausência (tipo 1) ou presença de feocromocitoma (tipo 2). A doença do tipo 2 é causada, essencialmente, por mutações missense no gene VHL. As mutações podem ser grandes deleções (20%) ou pontuais (80%) do tipo missense, frameshift, nonsense ou em regiões de splicing. O teste genético é considerado padrão para o manejo clínico dos pacientes e dos familiares em risco, pois permite o diagnóstico e o tratamento precoce das neoplasias, melhorando assim a expectativa de vida. Técnicas de biologia molecular, como o seqüenciamento direto do DNA e o Southern blotting quantitativo, permitem a detecção de mutações germinativas em até 100% dos casos. Técnicas mais recentes, como o PCR quantitativo em tempo real e o MLPA, têm sido empregadas para uma detecção mais eficaz de grandes deleções no gene VHL. Os objetivos do presente estudo foram: (1) diagnosticar os pacientes com suspeita da doença de VHL; (2) identificar e caracterizar mutações germinativas pontuais no gene VHL nos pacientes e em seus parentes de 1º grau; (3) fornecer o aconselhamento genético pré e pós-teste. Dos 37 indivíduos com suspeita da doença de VHL, 14 pacientes de sete famílias diferentes preencheram os critérios diagnósticos. Um paciente apresentou hemangioblastoma cerebelar isolado e sete parentes de 1º grau estavam assintomáticos. Foram realizadas as técnicas de PCR, RFLP e seqüenciamento direto do DNA genômico e após clonagem. Foram identificadas quatro mutações pontuais na região codificadora do gene VHL em quatro famílias diferentes, sendo que duas delas haviam sido descritas na literatura [c.226_228delTTC (F76del), c.217C>T (Q73X)]. As outras duas mutações são descritas pela primeira vez neste estudo e afetam o sitio de splicing (IVS1-1 G>A, IVS2-1 G>C). É provável que as demais três famílias sejam portadoras de deleções germinativas no gene VHL. Em resumo, os resultados apresentados neste estudo ampliam o conhecimento da base molecular da doença de VHL e consiste na primeira pesquisa de pós-graduação produzida pelo ambulatório de aconselhamento genético do câncer do HCFMRP-USP.Von Hippel-Lindau disease (VHL) is an autosomal dominant hereditary cancer syndrome that predisposes to the development of a variety of benign and malignant tumors. VHL is caused by germline and somatic mutations in the VHL gene and it has an incidence of approximately one in 36,000 livebirths. The VHL gene is a tumor suppressor that is translated into the VHL protein, which has many functions, mainly an ubiquitin-ligase activity, responsible for the polyubiquitylation and proteasomal degradation of the alpha subunit of the hipoxia-inducible factor (HIF) in the presence of oxygen. The main clinical features of VHL are: CNS hemangioblastomas, especially of the cerebellum and spinal cord; retinal angiomas and clear-cell renal carcinomas. The lifetime probability of developing one of these tumors is estimated at more than 70%, whichever may present since childhood until adulthood, more often during the 2nd and 3rd decades. VHL is classified into type 1 (without pheochromocytoma) and type 2 (with pheochromocytoma), the latter being mainly caused by missense mutations. VHL germline mutations may be rearrangements and large deletions (~20%) or point mutations (~80%), such as missense, frameshift, nonsense or in the splicing sites. VHL gene testing is considered standard for the clinical manegement of patients and relatives at risk, whereby it provides early diagnosis and treatment of tumors, improving their life expectancies. Molecular biology techniques such as sequencing and quantitative Southern blotting may detect virtually 100% of VHL germline mutations. More recent methods, such as quantitative real-time PCR and MLPA, have been shown to detect VHL gene gross deletions efficiently. The objectives of this study were: (1) to diagnose patients with VHL clinically; (2) to detect germline point mutations in the VHL gene in the patients and their close relatives at risk; (3) to provide pre and post-testing genetic counseling. Fourteen out of 37 patients from seven unrelated families fulfilled the VHL clinical diagnostic criteria, one patient presented a single cerebellar hemangioblastoma and seven at-risk relatives were still asymptomatic. The methods included: PCR, RFLP, genomic DNA direct sequencing and after cloning. Four germline point mutations in the coding region of the VHL gene were identified, two of whom had been described in literature [c.226_228delTTC (p.F76del), c.217C>T (p.Q73X)]. The other two mutations had not been described so far and affect the splicing sites (IVS1-1 G>A, IVS2-1 G>C). The other three families may carry gross germline deletions in the VHL gene. In conclusion, the outcome presented in this study provides with a greater knowledge of molecular basis of VHL disease and relies on the first post-graduation research carried out at the HCFMRP-USP cancer genetic counseling service
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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